The manga was adapted into an anime series, which was shown on Fuji TV in Japan from June 1965 to June 1966. While the basic set-up remains the same, the stories in the anime were different from those in the manga. There were 52 episodes of the anime, filmed in black-and-white.

An English dub of the series first aired in Australia (Melbourne TV) in April 1969, and in the United States in 1974.

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The story features three aliens who come to observe the Earth, and the adventures they have with a young human named Shinichi.

The series is set in the 1960's (a specific year is not given). Earth is in the midst of various wars, and has been experimenting with the hydrogen bomb. This gets the attention of the Milky Way Confederation, who send three investigators to Earth to determine if it can be saved.

To disguise their appearance, the team known as the Amazing Three - Captain Bokko and her deputies, Pukko and Nokko - transform into a rabbit, a duck and a horse, respectively. They find their way into the Japanese village of Ogawa-mura, and here meet a rambunctious but kind-hearted boy, Shinichi Hoshi.

Shinichi's older brother, Koichi, is secretly a member of a global intelligence agency known as "Phoenix". The Amazing Three and Shinichi find themselves joining in Phoenix's fight against evil. It is through these adventures that the Amazing Three see that Earth is not beyond saving.